JGrowl Component

Description

This component makes it possible to display Tapestry Alerts (using the AlertManager service), but
with the JavaScript behavior of the jGrowl plugin.
By default, the look of the alerts (info, warning, error) will be same. But, you will be able to
modify the look by using these CSS classes : jgrowl-t-info, jgrowl-t-warn and jgrowl-t-error.